On 20/07/2022 10:43, Sebastian Huber wrote:
Hello,
RTEMS applications are usually fully statically linked together with the
operating system. So, we can use the -ftls-model=local-exec TLS model.
The default value for this option is defined in common.opt:
ftls-model=
Common Joined RejectNegative Enum(tls_model) Var(flag_tls_default)
Init(TLS_MODEL_GLOBAL_DYNAMIC)
-ftls-model=[global-dynamic|local-dynamic|initial-exec|local-exec]
Set the default thread-local storage code generation model.
Would it be possible to customize the default value for RTEMS?
I think this could be done by adding
#define CC1_SPEC "%{!ftls-model=*:-ftls-model=local-exec}"
to gcc/config/rtems.h. However, the CC1_SPEC is also defined by several
targets. Would it be possible to add an OS_CC1_SPEC like this?
diff --git a/gcc/gcc.cc b/gcc/gcc.cc
index bb07cc244e3..7ddabc888b0 100644
--- a/gcc/gcc.cc
+++ b/gcc/gcc.cc
@@ -709,6 +709,12 @@ proper position among the other output files. */
#define CC1_SPEC ""
#endif
+/* config.h can define OS_CC1_SPEC to provide extra args to cc1 and cc1plus
+ or operating system specific extra switch-translations. */
+#ifndef OS_CC1_SPEC
+#define OS_CC1_SPEC ""
+#endif
+
/* config.h can define CC1PLUS_SPEC to provide extra args to cc1plus
or extra switch-translations. */
#ifndef CC1PLUS_SPEC
@@ -1194,7 +1200,7 @@ proper position among the other output files. */
static const char *asm_debug = ASM_DEBUG_SPEC;
static const char *asm_debug_option = ASM_DEBUG_OPTION_SPEC;
static const char *cpp_spec = CPP_SPEC;
-static const char *cc1_spec = CC1_SPEC;
+static const char *cc1_spec = CC1_SPEC OS_CC1_SPEC;
static const char *cc1plus_spec = CC1PLUS_SPEC;
static const char *link_gcc_c_sequence_spec = LINK_GCC_C_SEQUENCE_SPEC;
static const char *link_ssp_spec = LINK_SSP_SPEC;
How does Ada get its default TLS model?
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