[ruby-core:91149] [Ruby trunk Bug#15520] [patch] configure should refuse to build with jemalloc when headers are missing

Issue #15520 has been updated by naruse (Yui NARUSE).

Backport changed from 2.4: REQUIRED, 2.5: REQUIRED, 2.6: REQUIRED to 2.4: REQUIRED, 2.5: REQUIRED, 2.6: DONE

ruby_2_6 r66852 merged revision(s) 66779.

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Bug #15520: [patch] configure should refuse to build with jemalloc when headers are missing
https://bugs.ruby-lang.org/issues/15520#change-76380

* Author: mistydemeo (Misty De Meo)
* Status: Closed
* Priority: Normal
* Assignee: 
* Target version: 
* ruby -v: ruby 2.7.0dev (2019-01-10 fix_jemalloc_i.. 66768) [x86_64-darwin18]
* Backport: 2.4: REQUIRED, 2.5: REQUIRED, 2.6: DONE
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When the `--with-jemalloc` option is passed, the configure script will correctly fail with an error if the library is missing. However, if the library is present and headers are missing, configure will succeed and allow the build to proceed. The actual build is unlikely to succeed in this case since the functions won't be defined.

Steps to reproduce:
1. Install jemalloc.
2. Delete jemalloc's headers.
3. Run ./configure --with-jemalloc &&is  make

Expected behaviour:
configure fails because the requested jemalloc's headers are missing

Actual behaviour:
configure succeeds. On macOS, the build then fails with the following:

~~~
compiling gc.c
gc.c:7955:12: error: implicit declaration of function 'malloc_usable_size' is invalid in C99
      [-Werror,-Wimplicit-function-declaration]
    return malloc_usable_size(ptr);
           ^
gc.c:7955:12: note: did you mean 'malloc_good_size'?
/Library/Developer/CommandLineTools/SDKs/MacOSX10.14.sdk/usr/include/malloc/malloc.h:134:15: note:
      'malloc_good_size' declared here
extern size_t malloc_good_size(size_t size);
              ^
1 error generated.
make: *** [gc.o] Error 1
~~~

The attached patch fixes this by ensuring that configure fails if `--with-jemalloc` is passed but the headers are missing in the same way that it will fail if the library is missing.

This patch is against trunk. I've also reproduced it in several previous versions of Ruby.

---Files--------------------------------
0001-configure-refuse-to-build-with-jemalloc-when-header-.patch (933 Bytes)


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