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Support SOURCE_DATE_EPOCH for reproducible builds

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See https://reproducible-builds.org/docs/source-date-epoch/

Fixes #286
This commit is contained in:
Rangi
2020-12-16 11:08:18 -05:00
committed by Eldred Habert
parent 063a22ddf9
commit ad6f17cd93
4 changed files with 21 additions and 6 deletions
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3
include/asm/symbol.h
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@@ -12,6 +12,7 @@
#include <stdbool.h> #include <stdbool.h>
#include <stdint.h> #include <stdint.h>
#include <string.h> #include <string.h>
#include <time.h>
#include "asm/section.h" #include "asm/section.h"
@@ -140,7 +141,7 @@ struct Symbol *sym_AddMacro(char const *symName, int32_t defLineNo, char *body,
struct Symbol *sym_Ref(char const *symName); struct Symbol *sym_Ref(char const *symName);
struct Symbol *sym_AddString(char const *symName, char const *value); struct Symbol *sym_AddString(char const *symName, char const *value);
void sym_Purge(char const *symName); void sym_Purge(char const *symName);
void sym_Init(void); void sym_Init(time_t now);
/* Functions to save and restore the current symbol scope. */ /* Functions to save and restore the current symbol scope. */
char const *sym_GetCurrentSymbolScope(void); char const *sym_GetCurrentSymbolScope(void);

14
src/asm/main.c
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@@ -218,7 +218,7 @@ static char *make_escape(const char *str)
} }
/* Short options */ /* Short options */
static char const *optstring = "b:D:Eg:hi:LM:o:p:r:VvW:w"; static const char *optstring = "b:D:Eg:hi:LM:o:p:r:VvW:w";
/* Variables for the long-only options */ /* Variables for the long-only options */
static int depType; /* Variants of `-M` */ static int depType; /* Variants of `-M` */
@@ -283,6 +283,16 @@ int main(int argc, char *argv[])
char *tzMainfile; char *tzMainfile;
time_t now = time(NULL);
char *sourceDateEpoch = getenv("SOURCE_DATE_EPOCH");
/*
* Support SOURCE_DATE_EPOCH for reproducible builds
* https://reproducible-builds.org/docs/source-date-epoch/
*/
if (sourceDateEpoch)
now = (time_t)strtoul(sourceDateEpoch, NULL, 0);
dependfile = NULL; dependfile = NULL;
/* Initial number of allocated elements in array */ /* Initial number of allocated elements in array */
@@ -481,7 +491,7 @@ int main(int argc, char *argv[])
nTotalLines = 0; nTotalLines = 0;
nIFDepth = 0; nIFDepth = 0;
sym_Init(); sym_Init(now);
sym_SetExportAll(exportall); sym_SetExportAll(exportall);
opt_ParseDefines(); opt_ParseDefines();

6
src/asm/rgbasm.5
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@@ -1092,6 +1092,12 @@ The following symbols are defined by the assembler:
.It Ic EQU Ta Dv __RGBDS_MINOR__ Ta Minor version number of RGBDS .It Ic EQU Ta Dv __RGBDS_MINOR__ Ta Minor version number of RGBDS
.It Ic EQU Ta Dv __RGBDS_PATCH__ Ta Patch version number of RGBDS .It Ic EQU Ta Dv __RGBDS_PATCH__ Ta Patch version number of RGBDS
.El .El
.Pp
The current time values will be taken from the
.Dv SOURCE_DATE_EPOCH
environment variable if that is defined as a UNIX timestamp.
Refer to the spec at
.Lk https://reproducible-builds.org/docs/source-date-epoch/ .
.Sh DEFINING DATA .Sh DEFINING DATA
.Ss Declaring variables in a RAM section .Ss Declaring variables in a RAM section
.Ic DS .Ic DS

4
src/asm/symbol.c
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@@ -655,7 +655,7 @@ static inline struct Symbol *createBuiltinSymbol(char const *name)
/* /*
* Initialize the symboltable * Initialize the symboltable
*/ */
void sym_Init(void) void sym_Init(time_t now)
{ {
PCSymbol = createBuiltinSymbol("@"); PCSymbol = createBuiltinSymbol("@");
struct Symbol *_NARGSymbol = createBuiltinSymbol("_NARG"); struct Symbol *_NARGSymbol = createBuiltinSymbol("_NARG");
@@ -677,8 +677,6 @@ void sym_Init(void)
sym_AddEqu("__RGBDS_MINOR__", PACKAGE_VERSION_MINOR)->isBuiltin = true; sym_AddEqu("__RGBDS_MINOR__", PACKAGE_VERSION_MINOR)->isBuiltin = true;
sym_AddEqu("__RGBDS_PATCH__", PACKAGE_VERSION_PATCH)->isBuiltin = true; sym_AddEqu("__RGBDS_PATCH__", PACKAGE_VERSION_PATCH)->isBuiltin = true;
time_t now = time(NULL);
if (now == (time_t)-1) { if (now == (time_t)-1) {
warn("Couldn't determine current time"); warn("Couldn't determine current time");
/* Fall back by pretending we are at the Epoch */ /* Fall back by pretending we are at the Epoch */