[PATCH] Remove ccache wrappers

[Paul Fertser]

These wrappers are not needed as CC doesn't need to be a single word.

a53b084e497a9f1629a2caada833ebe14a6838b7 which introduced the wrappers
doesn't explain why they were really needed and why only for the target
and not for the host.

Moreover, name of the wrappers breaks a ccache assumption: since
v4.0-3-g6a92b4cd3a67 it has special handling for "chained" invocation
such as "ccache ccache gcc" where it skips all the "ccache*" names in
the middle and proceeds to run as if it was started as "ccache
gcc"[1][2].

This becomes important when a build system sees ccache in the PATH and
automatically enables it by prepending to CC. An example of such a
system would be autosetup as used by jimtcl. With the wrappers it breaks
as the command line ends up being just "ccache -Os..." because
"ccache_cc" gets skipped as it starts with "ccache".

[1] https://github.com/ccache/ccache/blob/master/src/ccache.cpp#L2105
[2] https://github.com/ccache/ccache/blob/master/src/Util.cpp#L802

Reported-by: Karl Palsson <karlp at etactica.com>
Signed-off-by: Paul Fertser <fercerpav at gmail.com>
---

I tried CONFIG_ALL=y build and fixed bad packaging where I noticed:
https://github.com/openwrt/packages/pull/20353

Also sent a patch for Alpine (in private) and a patch/bug report to
libicu upstream: https://github.com/unicode-org/icu/pull/2290 .

My notion is that properly fixing affected software is better in the
long run. However just renaming the wrappers is an option too if it's
much less painful in the end. One potential downside would be that the
build systems wouldn't be able to detect e.g. GCC vs clang if used
with a wrapper and wouldn't apply custom build flags.

 rules.mk                      |  4 ++--
 tools/ccache/Makefile         | 10 ----------
 tools/ccache/files/ccache_cc  |  2 --
 tools/ccache/files/ccache_cxx |  2 --
 4 files changed, 2 insertions(+), 16 deletions(-)
 delete mode 100755 tools/ccache/files/ccache_cc
 delete mode 100755 tools/ccache/files/ccache_cxx

diff --git a/rules.mk b/rules.mk
index 3d151338af11..a2f5bcca4b0d 100644
--- a/rules.mk
+++ b/rules.mk
@@ -283,8 +283,8 @@ export HOSTCC_NOCACHE
 export HOSTCXX_NOCACHE
 
 ifneq ($(CONFIG_CCACHE),)
-  TARGET_CC:= ccache_cc
-  TARGET_CXX:= ccache_cxx
+  TARGET_CC:= ccache $(TARGET_CC)
+  TARGET_CXX:= ccache $(TARGET_CXX)
   HOSTCC:= ccache $(HOSTCC)
   HOSTCXX:= ccache $(HOSTCXX)
   export CCACHE_BASEDIR:=$(TOPDIR)
diff --git a/tools/ccache/Makefile b/tools/ccache/Makefile
index 25ab4a46eabe..6824dbddfd40 100644
--- a/tools/ccache/Makefile
+++ b/tools/ccache/Makefile
@@ -28,14 +28,4 @@ ifneq (docs-$(CONFIG_BUILD_DOCUMENTATION),docs-y)
 CMAKE_HOST_OPTIONS += -DENABLE_DOCUMENTATION=OFF
 endif
 
-define Host/Install/ccache
-	$(INSTALL_DIR) $(STAGING_DIR_HOST)/bin/
-	$(CP) ./files/* $(STAGING_DIR_HOST)/bin/
-endef
-
-define Host/Install
-	$(call Host/Install/Default)
-	$(call Host/Install/ccache)
-endef
-
 $(eval $(call HostBuild))
diff --git a/tools/ccache/files/ccache_cc b/tools/ccache/files/ccache_cc
deleted file mode 100755
index 01c4ad42a21d..000000000000
--- a/tools/ccache/files/ccache_cc
+++ /dev/null
@@ -1,2 +0,0 @@
-#!/bin/sh
-exec ccache "${TARGET_CC_NOCACHE}" "$@"
diff --git a/tools/ccache/files/ccache_cxx b/tools/ccache/files/ccache_cxx
deleted file mode 100755
index cc60eb3a13c7..000000000000
--- a/tools/ccache/files/ccache_cxx
+++ /dev/null
@@ -1,2 +0,0 @@
-#!/bin/sh
-exec ccache "${TARGET_CXX_NOCACHE}" "$@"
-- 
2.32.0