Revert "Revert r305164/5/7."

Restore the `-gz` option to the driver with some minor tweaks to handle
the additional case for `-Wa,--compress-debug-sections`.

This intends to make the compression of the debug information
controllable from the driver.  The following is the behaviour:

  -gz           enable compression (ambiguous for format, will default to zlib-gnu)
  -gz=none      disable compression
  -gz=zlib-gnu  enable compression (deprecated GNU style zlib compression)
  -gz=zlib      enable compression (zlib based compression)

Although -Wa,-compress-debug-sections works, it should be discouraged
when using the driver to invoke the assembler.  However, we permit the
assembler to accept the GNU as style argument --compress-debug-sections
to maintain compatibility.

Note, -gz/-gz= does *NOT* imply -g.  That is, you need to additionally
specific -g for debug information to be generated.

llvm-svn: 306115

1 files changed, 33 insertions, 5 deletions

diff --git a/clang/test/Driver/compress.c b/clang/test/Driver/compress.c
index 6cdc6b72243..a00ce91225b 100644
--- a/clang/test/Driver/compress.c
+++ b/clang/test/Driver/compress.c
@@ -1,8 +1,36 @@
-// RUN: %clang -### -c -integrated-as -Wa,-compress-debug-sections %s 2>&1 | FileCheck --check-prefix=COMPRESS_DEBUG %s
-// RUN: %clang -### -c -integrated-as -Wa,--compress-debug-sections %s 2>&1 | FileCheck --check-prefix=COMPRESS_DEBUG %s
 // REQUIRES: zlib
 
-// COMPRESS_DEBUG: "-compress-debug-sections"
+// RUN: %clang -### -fintegrated-as -Wa,-compress-debug-sections -c %s 2>&1 | FileCheck -check-prefix CHECK-_COMPRESS_DEBUG_SECTIONS %s
+// CHECK-_COMPRESS_DEBUG_SECTIONS: "-compress-debug-sections"
+
+// RUN: %clang -### -fintegrated-as -Wa,--compress-debug-sections -c %s 2>&1 | FileCheck -check-prefix CHECK-__COMPRESS_DEBUG_SECTIONS %s
+// CHECK-__COMPRESS_DEBUG_SECTIONS: "--compress-debug-sections"
+
+// RUN: %clang -### -fintegrated-as -Wa,--compress-debug-sections -Wa,--nocompress-debug-sections -c %s 2>&1 | FileCheck -check-prefix CHECK-POSNEG %s
+// CHECK-POSNEG: "--compress-debug-sections"
+// CHECK-POSNEG: "--nocompress-debug-sections"
+
+// RUN: %clang -### -fintegrated-as -Wa,-compress-debug-sections -Wa,--compress-debug-sections -c %s 2>&1 | FileCheck -check-prefix CHECK-MULTIPLE %s
+// CHECK-MULTIPLE: "-compress-debug-sections"
+// CHECK-MULTIPLE: "--compress-debug-sections"
+
+// RUN: %clang -### -fintegrated-as -gz -x assembler -c %s 2>&1 | FileCheck -check-prefix CHECK-OPT_GZ %s
+// RUN: %clang -### -fintegrated-as -gz -c %s 2>&1 | FileCheck -check-prefix CHECK-OPT_GZ %s
+// CHECK-OPT_GZ: "-compress-debug-sections"
+
+// RUN: %clang -### -fintegrated-as -gz=none -x assembler -c %s 2>&1 | FileCheck -check-prefix CHECK-OPT_GZ_EQ_NONE %s
+// RUN: %clang -### -fintegrated-as -gz=none -c %s 2>&1 | FileCheck -check-prefix CHECK-OPT_GZ_EQ_NONE %s
+// CHECK-OPT_GZ_EQ_NONE: "-compress-debug-sections=none"
+
+// RUN: %clang -### -fintegrated-as -gz=zlib -x assembler -c %s 2>&1 | FileCheck -check-prefix CHECK-OPT_GZ_EQ_ZLIB %s
+// RUN: %clang -### -fintegrated-as -gz=zlib -c %s 2>&1 | FileCheck -check-prefix CHECK-OPT_GZ_EQ_ZLIB %s
+// CHECK-OPT_GZ_EQ_ZLIB: "-compress-debug-sections=zlib"
+
+// RUN: %clang -### -fintegrated-as -gz=zlib-gnu -x assembler -c %s 2>&1 | FileCheck -check-prefix CHECK-OPT_GZ_EQ_ZLIB_GNU %s
+// RUN: %clang -### -fintegrated-as -gz=zlib-gnu -c %s 2>&1 | FileCheck -check-prefix CHECK-OPT_GZ_EQ_ZLIB_GNU %s
+// CHECK-OPT_GZ_EQ_ZLIB_GNU: "-compress-debug-sections=zlib-gnu"
+
+// RUN: %clang -### -fintegrated-as -gz=invalid -x assembler -c %s 2>&1 | FileCheck -check-prefix CHECK-OPT_GZ_EQ_INVALID %s
+// RUN: %clang -### -fintegrated-as -gz=invalid -c %s 2>&1 | FileCheck -check-prefix CHECK-OPT_GZ_EQ_INVALID %s
+// CHECK-OPT_GZ_EQ_INVALID: error: unsupported argument 'invalid' to option 'gz='
 
-// RUN: %clang -### -c -integrated-as -Wa,--compress-debug-sections -Wa,--nocompress-debug-sections %s 2>&1 | FileCheck --check-prefix=NOCOMPRESS_DEBUG %s
-// NOCOMPRESS_DEBUG-NOT: "-compress-debug-sections"