Improve handling of platform-specific build options (#2162)

* Opt into POSIX functions with `_POSIX_C_SOURCE` before any system
  headers are `#include`d
* Allow user to override `make develop`'s `WARNFLAGS` and `CXXFLAGS`
* Use `make develop` on 32-bit Cygwin with sanitizers disabled
* Do not unnecessarily redefine `fseek` and `ftell`
* Disable a false-positive `-Wno-null-dereference` on 32-bit Cygwin

Co-authored-by: ISSOtm <[email protected]>

src/asm/fstack.cpp

@@ -1,5 +1,7 @@
 // SPDX-License-Identifier: MIT
 
+#include "platform.hpp" // strncasecmp
+
 #include "asm/fstack.hpp"
 #include <sys/stat.h>
 
@@ -22,7 +24,6 @@
 #include "helpers.hpp"
 #include "itertools.hpp" // reversed
 #include "linkdefs.hpp"
-#include "platform.hpp" // strncasecmp
 #include "verbosity.hpp"
 
 #include "asm/intern.hpp"

src/asm/lexer.cpp

@@ -1,5 +1,7 @@
 // SPDX-License-Identifier: MIT
 
+#include "platform.hpp"
+
 #include "asm/lexer.hpp"
 #include <sys/stat.h>
 
@@ -27,7 +29,6 @@
 #include <vector>
 
 #include "helpers.hpp"
-#include "platform.hpp"
 #include "style.hpp"
 #include "util.hpp"
 #include "verbosity.hpp"

src/asm/main.cpp

@@ -1,5 +1,7 @@
 // SPDX-License-Identifier: MIT
 
+#include "platform.hpp"
+
 #include "asm/main.hpp"
 
 #include <algorithm>
@@ -23,8 +25,7 @@
 #include "diagnostics.hpp"
 #include "helpers.hpp"
 #include "parser.hpp" // Generated from parser.y
-#include "platform.hpp"
-#include "style.hpp" // style_Parse
+#include "style.hpp"  // style_Parse
 #include "usage.hpp"
 #include "util.hpp" // UpperMap
 #include "verbosity.hpp"

src/asm/output.cpp

@@ -1,5 +1,7 @@
 // SPDX-License-Identifier: MIT
 
+#include "platform.hpp"
+
 #include "asm/output.hpp"
 
 #include <algorithm>
@@ -16,7 +18,6 @@
 
 #include "helpers.hpp" // assume, Defer
 #include "linkdefs.hpp"
-#include "platform.hpp"
 #include "util.hpp" // xfclose
 
 #include "asm/charmap.hpp"

src/asm/section.cpp

@@ -1,5 +1,7 @@
 // SPDX-License-Identifier: MIT
 
+#include "platform.hpp" // fseek
+
 #include "asm/section.hpp"
 
 #include <algorithm>
@@ -21,8 +23,7 @@
 #include "helpers.hpp"
 #include "itertools.hpp" // InsertionOrderedMap
 #include "linkdefs.hpp"
-#include "platform.hpp" // fseek
-#include "util.hpp"     // xfclose, seekSize
+#include "util.hpp" // xfclose, seekSize
 
 #include "asm/fstack.hpp"
 #include "asm/lexer.hpp"

src/backtrace.cpp

@@ -1,12 +1,13 @@
 // SPDX-License-Identifier: MIT
 
+#include "platform.hpp" // strcasecmp
+
 #include "backtrace.hpp"
 
 #include <optional>
 #include <stdint.h>
 
-#include "platform.hpp" // strcasecmp
-#include "util.hpp"     // parseWholeNumber
+#include "util.hpp" // parseWholeNumber
 
 Tracing tracing;
 

src/fix/fix.cpp

@@ -1,5 +1,7 @@
 // SPDX-License-Identifier: MIT
 
+#include "platform.hpp"
+
 #include "fix/fix.hpp"
 #include <sys/stat.h>
 
@@ -14,7 +16,6 @@
 
 #include "diagnostics.hpp"
 #include "helpers.hpp"
-#include "platform.hpp"
 #include "util.hpp" // xclose, xfclose
 
 #include "fix/main.hpp"

src/fix/main.cpp

@@ -1,5 +1,7 @@
 // SPDX-License-Identifier: MIT
 
+#include "platform.hpp"
+
 #include "fix/main.hpp"
 
 #include <errno.h>
@@ -15,7 +17,6 @@
 #include "cli.hpp"
 #include "diagnostics.hpp"
 #include "helpers.hpp"
-#include "platform.hpp"
 #include "style.hpp"
 #include "usage.hpp"
 #include "util.hpp"

src/fix/mbc.cpp

@@ -1,5 +1,7 @@
 // SPDX-License-Identifier: MIT
 
+#include "platform.hpp" // strcasecmp
+
 #include "fix/mbc.hpp"
 
 #include <optional>
@@ -10,8 +12,7 @@
 #include <unordered_map>
 #include <utility>
 
-#include "helpers.hpp"  // unreachable_
-#include "platform.hpp" // strcasecmp
+#include "helpers.hpp" // unreachable_
 #include "util.hpp"
 
 #include "fix/warning.hpp"

src/gfx/main.cpp

@@ -1,5 +1,7 @@
 // SPDX-License-Identifier: MIT
 
+#include "platform.hpp"
+
 #include "gfx/main.hpp"
 
 #include <inttypes.h>
@@ -19,7 +21,6 @@
 #include "diagnostics.hpp"
 #include "file.hpp"
 #include "helpers.hpp"
-#include "platform.hpp"
 #include "style.hpp" // style_Parse
 #include "usage.hpp"
 #include "util.hpp"

src/gfx/pal_spec.cpp

@@ -1,5 +1,7 @@
 // SPDX-License-Identifier: MIT
 
+#include "platform.hpp"
+
 #include "gfx/pal_spec.hpp"
 
 #include <algorithm>
@@ -22,7 +24,6 @@
 #include "diagnostics.hpp"
 #include "file.hpp"
 #include "helpers.hpp"
-#include "platform.hpp"
 #include "util.hpp" // UpperMap, parseDigit
 
 #include "gfx/main.hpp"

src/link/assign.cpp

@@ -1,5 +1,7 @@
 // SPDX-License-Identifier: MIT
 
+#include "platform.hpp"
+
 #include "link/assign.hpp"
 
 #include <algorithm>
@@ -16,7 +18,6 @@
 #include "helpers.hpp"
 #include "itertools.hpp"
 #include "linkdefs.hpp"
-#include "platform.hpp"
 #include "verbosity.hpp"
 
 #include "link/main.hpp"

src/link/object.cpp

@@ -1,5 +1,7 @@
 // SPDX-License-Identifier: MIT
 
+#include "platform.hpp"
+
 #include "link/object.hpp"
 
 #include <deque>
@@ -18,7 +20,6 @@
 
 #include "helpers.hpp"
 #include "linkdefs.hpp"
-#include "platform.hpp"
 #include "util.hpp" // xfclose
 #include "verbosity.hpp"
 #include "version.hpp"

src/link/output.cpp

@@ -1,5 +1,7 @@
 // SPDX-License-Identifier: MIT
 
+#include "platform.hpp"
+
 #include "link/output.hpp"
 
 #include <algorithm>
@@ -19,7 +21,6 @@
 #include "extern/utf8decoder.hpp"
 #include "helpers.hpp"
 #include "linkdefs.hpp"
-#include "platform.hpp"
 #include "util.hpp"
 
 #include "link/main.hpp"

src/link/sdas_obj.cpp

@@ -1,5 +1,7 @@
 // SPDX-License-Identifier: MIT
 
+#include "platform.hpp"
+
 #include "link/sdas_obj.hpp"
 
 #include <inttypes.h>
@@ -14,7 +16,6 @@
 
 #include "helpers.hpp" // assume, literal_strlen
 #include "linkdefs.hpp"
-#include "platform.hpp"
 #include "util.hpp" // parseWholeNumber
 
 #include "link/fstack.hpp"

src/style.cpp

@@ -3,14 +3,14 @@
 // This implementation was based on https://github.com/agauniyal/rang/
 // and adapted for RGBDS.
 
+#include "platform.hpp" // isatty, strcasecmp
+
 #include "style.hpp"
 
 #include <stdio.h>
 #include <stdlib.h> // getenv
 #include <string.h>
 
-#include "platform.hpp" // isatty, strcasecmp
-
 #if !STYLE_ANSI
 // clang-format off: maintain `include` order
 	#define WIN32_LEAN_AND_MEAN // Include less from `windows.h`

src/usage.cpp

@@ -1,5 +1,7 @@
 // SPDX-License-Identifier: MIT
 
+#include "platform.hpp"
+
 #include "usage.hpp"
 
 #include <stdarg.h>
@@ -8,7 +10,6 @@
 
 #include "diagnostics.hpp" // vfatalx
 #include "helpers.hpp"
-#include "platform.hpp"
 #include "style.hpp"
 #include "util.hpp" // parseWholeNumber
 #include "version.hpp"

src/util.cpp

@@ -1,5 +1,7 @@
 // SPDX-License-Identifier: MIT
 
+#include "platform.hpp"
+
 #include "util.hpp"
 
 #include <errno.h>
@@ -9,7 +11,6 @@
 #include <string.h> // strspn
 
 #include "helpers.hpp" // assume
-#include "platform.hpp"
 
 int xfclose(FILE *file) {
 	if (file == stdin || file == stdout || file == stderr) {