Bug 1386077 - Compile freebl using -std=gnu99 for all C compilers on …

…Linux. r=mt,kaie

Summary:
Compilation of the HaCl* formally verified C code requires C99 syntax for loops.
This patch enables GNU C99 syntax on all C compilers for Linux by passing -std=gnu99.

Reviewers: kaie, franziskus

Subscribers: mt, bbeurdouche

Differential Revision: https://nss-review.dev.mozaws.net/D388

lib/freebl/config.mk

@@ -90,7 +90,12 @@ EXTRA_SHARED_LIBS += \
 endif
 endif
 
+ifeq ($(OS_ARCH), Linux)
+CFLAGS += -std=gnu99
+endif
+
 ifeq ($(OS_ARCH), Darwin)
+CFLAGS += -std=gnu99
 EXTRA_SHARED_LIBS += -dylib_file @executable_path/libplc4.dylib:$(DIST)/lib/libplc4.dylib -dylib_file @executable_path/libplds4.dylib:$(DIST)/lib/libplds4.dylib
 endif
 

lib/freebl/freebl.gyp

@@ -166,6 +166,7 @@
           'OTHER_CFLAGS': [
             '-mpclmul',
             '-maes',
+            '-std=gnu99',
           ],
         },
       }],
@@ -232,6 +233,9 @@
           'FREEBL_LOWHASH',
           'FREEBL_NO_DEPEND',
         ],
+        'cflags': [
+          '-std=gnu99',
+        ],
       }],
       [ 'OS=="linux" or OS=="android"', {
         'conditions': [